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                Ural 1745 Yet Another Answer                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
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                                <h3>题目描述</h3><p><p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; text-indent: 21pt; text-align: left;"><span style="font-family: 'Times New Roman', serif; font-size: 14px; line-height: 18px; text-indent: 21pt;">外星人制造了超级电脑来思考生命，宇宙，以及世界万物的答案，最后得出了42这个结果。人们并不满意于这个答案，于是再一次设计了超级电脑。经历了&pi;百万年的计算，再一次得出了新的答案。</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; text-indent: 21pt;"><font face="Times New Roman, serif"><span style="font-size: 14px; line-height: 18px;">答案是由一些字符串组成的，每个字符串都只包含&ldquo;(&rdquo;和&ldquo;)&rdquo;两种字符。</span></font></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; text-indent: 21pt;"><font face="Times New Roman, serif"><span style="font-size: 14px; line-height: 18px;">现在的问题是，从这些字符串中选取一些，按照一定的顺序连接起来，使得构成一个合法的括号序列而且长度尽量长。</span></font></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; text-indent: 21pt; text-align: left;"></p>
<p class="MsoNormal" style="margin: 0cm 0cm 12pt 21pt; font-size: 10.5pt; font-family: 'Times New Roman', serif; line-height: 18px; text-align: left;"></p>
<p></p></p><hr/><h3>输入格式</h3><p><div>
<div>本题存在多组数据，请做到文件底结束,任两组数据间存在一空行</div>
<div>第一行正整数 N (1 &le; N &le; 1,000).表示字符串个数。</div>
<div>接下来N行每行一个字符串。总长度不超过10,000。（编号1到N）</div>
<p class="MsoNormal" style="margin: 0cm 0cm 12pt 21pt; font-size: 10.5pt; font-family: 'Times New Roman', serif; line-height: 18px;"></p>
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<p></p></p><hr/><h3>输出格式</h3><p><div><span style="font-family: SimSun; font-size: 14px; line-height: 18px;">对于每组数据输出最大长度</span></div>
<p></p></p><hr/><h3>样例输入</h3><pre>3
()
(()
)</pre><hr/><h3>样例输出</h3><pre>6</pre><hr/><h3>提示</h3><p><p>样例解释</p>
<p>(())()</p>
<p></p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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